instalee/handlers/apt/install_source

#!/bin/sh -e
sudo apt-get install -y debian-keyring debian-archive-keyring apt-transport-https
curl="curl --tlsv1.2 -fsSL $1"
case $1 in
(*.gpg) sudo $curl -o "$2";;
(*.key) $curl | sudo gpg --dearmor --yes -o "$2";;
(*) echo 'Unknown key type' >&2; false;;
esac